auth: implement OAuth2 flow.oauth2_auth_flow

Add code to implement the OAuth2 flow.

* Add test fixtures for setting up users and OAuth2 clients
* Add tests for token generation with the "Password Grant" flow
* Fix some issues with test due to changes in the database connection's
  row_factory

1 files changed, 21 insertions, 0 deletions

diff --git a/gn3/auth/authentication/oauth2/endpoints/revocation.py b/gn3/auth/authentication/oauth2/endpoints/revocation.py
new file mode 100644
index 0000000..0693c2d
--- /dev/null
+++ b/gn3/auth/authentication/oauth2/endpoints/revocation.py
@@ -0,0 +1,21 @@
+"""Handle token revocation."""
+
+from flask import current_app
+from authlib.oauth2.rfc7009 import RevocationEndpoint as _RevocationEndpoint
+
+from gn3.auth import db
+from gn3.auth.authentication.oauth2.models.oauth2token import (
+    save_token, OAuth2Token, revoke_token)
+
+from .utilities import query_token as _query_token
+
+class RevocationEndpoint(_RevocationEndpoint):
+    """Revoke the tokens"""
+    def query_token(self, token_string: str, token_type_hint: str):
+        """Query the token."""
+        return _query_token(self, token_string, token_type_hint)
+
+    def revoke_token(self, token: OAuth2Token, request):
+        """Revoke token `token`."""
+        with db.connection(current_app.config["AUTH_DB"]) as conn:
+            save_token(conn, revoke_token(token))